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@DFP
Id say over 25 and some creaks are expected, unless you battered the fuck out of them with some sport its pretty unusual. But no need to worry, its just wear and tear. Ironically, keeping active and bending your knee across the full range of motion (even if it is creaky as fuck) will help. The cartilage has no bloody supply, it is nourished by movement & pressure changes in the knee encouraging fluid filled with nutrients/oxygen to diffuse into cartilage. This keeps it alive and supple. Weight bearing also encourages thickening of cartilage in most heavily loaded spots, and articulating knee through clicky sections, helps to wear down any scar tissue or frayed cartilage.
But of course, your are just getting older and have to put up with shit wearing out. Just understand that easing off/worrying about arthritis wont necessarily help.
Main tip for protecting knees, if you run. Dont heel strike!